2p^2+7p-8=0

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Solution for 2p^2+7p-8=0 equation:


Simplifying
2p2 + 7p + -8 = 0

Reorder the terms:
-8 + 7p + 2p2 = 0

Solving
-8 + 7p + 2p2 = 0

Solving for variable 'p'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-4 + 3.5p + p2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 3.5p + 4 + p2 = 0 + 4

Reorder the terms:
-4 + 4 + 3.5p + p2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 3.5p + p2 = 0 + 4
3.5p + p2 = 0 + 4

Combine like terms: 0 + 4 = 4
3.5p + p2 = 4

The p term is 3.5p.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5p + 3.0625 + p2 = 4 + 3.0625

Reorder the terms:
3.0625 + 3.5p + p2 = 4 + 3.0625

Combine like terms: 4 + 3.0625 = 7.0625
3.0625 + 3.5p + p2 = 7.0625

Factor a perfect square on the left side:
(p + 1.75)(p + 1.75) = 7.0625

Calculate the square root of the right side: 2.657536453

Break this problem into two subproblems by setting 
(p + 1.75) equal to 2.657536453 and -2.657536453.

Subproblem 1

p + 1.75 = 2.657536453 Simplifying p + 1.75 = 2.657536453 Reorder the terms: 1.75 + p = 2.657536453 Solving 1.75 + p = 2.657536453 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + p = 2.657536453 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + p = 2.657536453 + -1.75 p = 2.657536453 + -1.75 Combine like terms: 2.657536453 + -1.75 = 0.907536453 p = 0.907536453 Simplifying p = 0.907536453

Subproblem 2

p + 1.75 = -2.657536453 Simplifying p + 1.75 = -2.657536453 Reorder the terms: 1.75 + p = -2.657536453 Solving 1.75 + p = -2.657536453 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + p = -2.657536453 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + p = -2.657536453 + -1.75 p = -2.657536453 + -1.75 Combine like terms: -2.657536453 + -1.75 = -4.407536453 p = -4.407536453 Simplifying p = -4.407536453

Solution

The solution to the problem is based on the solutions from the subproblems. p = {0.907536453, -4.407536453}

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